Triethylamine → HCID 69110315, compound

Participants

Reaction Steps

A mixture of 5-dimethylamino-2-aminotetraline-2-carboxylic acid (1.33 g, 2.15 mmole theoretical), triethylamine (0.40 ml, 2.87 mmole), 9-fluorenylmethyl succinimidyl carbonate (Fmoc-OSu, 0.92 g, 2.73 mmole) in acetonitrile (10 ml) and water (10 ml) was stirred at room temperature for one day. TLC analysis of the reaction indicated the presence of starting material amino acid. 9-fluorenylmethyl succinimidyl carbonate (400 mg) and triethylamine (0.2 ml) were added and the mixture was stirred at room temperature for another day. The reaction mixture was concentrated in vacuo to remove most of the acetonitrile and the almost neutral mixture was extracted three times with ethyl acetate. The combined organic layers were washed with water, brine, dried over sodium sulfate. Filtration and concentration gave a crude which was purified by column chromatography (eluted with 2.5→6→10→15→20% methanol/methylene chloride) to give racemic Fmoc-5-dimethylamino-2-aminotetraline-2-carboxylic acid (602 mg, 61% yield over 2 steps) as an off-white solid. HRMS (FAB): C28H28N2O4 (M) calc. 456.2049; observed: 456.2056.

Provenance & Evidence